Non Module File Vivado







11/12/2013 2013. 0) July 31, 2012 www. The VIVADO has powerful simulator intool which is VIVADO Simulator which can be used for Run Behavioural Simulation, Pre/Post synthesis Simulation and Pre/Post Implementation Simulation. Using Vivado to create a simple Test Fixture in Verilog In this tutorial we will create a simple combinational circuit and then create a test fixture (test bench) to simulate and test the correct operation of the circuit. In Vivado 2017. Start Vivado and execute the Tcl script to create the processor design checkpoint for the static design with one RP. 1 Tutorials on the Xilinx. Getting Started With Xilinx Vivado W/ Digilent Nexys 4 FPGA 1 - Build Multiple Inputs AND Logic Gate: I do this instructable because it looks like there is not simple getting started tutorial to teach people to use the latest Xilinx Vivado CAD tool. 1) Note: you will need the Xilinx Vivado Webpack version installed on your computer (or you can use the department systems). First, create a project Tcl in the vendor gui. You can follow this for the Xilinx-provided ug947-vivado-partial-reconfiguration-tutorial. Using Vivado with and without project file (. I'll copy and clean up the template into my top module file, I'll also add clk_p and clk_n as inputs to the top module so I can route them into the IBUFDS instance. As demonstrated by this example the memory array can have more entries than the data file. Choose "Add or create design sources" and click "Next". In this series, Sarah Harris, a professor in Electrical & Computer Engineering at UNLV, explores the MIPSfpga soft-core processor from its introduction through to advanced topics. When the auto-configuration algorithm detects an ISE/Vivado project layout, it scans the existing ISE/Vivado project configuration files and automatically generates an equivalent DVT build configuration file (for example default. The test bench will generate the necessary inputs for the module under analysis (Here "myModule"). zip file contents as. By default, the flow only creates a single implementation for each IP. 1 Release Notes 5 UG973 (v2017. h Header file for the filter and test bench. For the changes to take effect in your project you must reload it in to Vivado and then re instantiate it. Hi, Quite often I see such piece of code on the github repositories. Then reference this in the files_l list. Create a folder named sdk_sources under the hierarchy's folder in the repo. Such a system requires both specifying the hardware architecture and the software running on it. se March 21, 2017 This tutorial shows you how to create and run a simple MicroBlaze-based system on a Digilent Nexys-4 prototyping board. vhd under non-module files (right click on the file and select "Remove file from project"). 1 as required by the branch. The last thing make does in this above example is building the project. The control to run synthesis on the module is controlled by the synth attribute, and assigned to one of the flow control variables at the top of design. Generate DCP’s for static design and RM modules i. The VIVADO has powerful simulator intool which is VIVADO Simulator which can be used for Run Behavioural Simulation, Pre/Post synthesis Simulation and Pre/Post Implementation Simulation. The source files created can be found in the Sources menu at the top left, double click on any file to open it for editing. > or you can use > vivado -mode tcl -source foo. The Basys 3 is an entry-level FPGA development board designed exclusively for Vivado Design Suite, featuring Xilinx Artix-7 FPGA architecture. Hi Nils, There is a file called FPGA map address in /redpitaya/fpga/doc. If you change the module and over write the generated TCL description. An object of an access type must be of class variable. The Vivado Design Suite provides an environment to configure, implement, verify, and integrate IP as a standalone module or within the context of the system-level design. I tried to search the problem but I couldn't find it on the internet. A test bench is nothing but another Verilog module that generates some signals and feeds it to the module under test. Step 1: Download and install Vivado Board Support Package files for Mimas A7 from here. In this way, we can implement a particular module in the OOC mode and avoid consuming additional CPU cycles for that module when implementing the top-level module. See: Design Examples. Download and install Vivado Board Support Package files for the Numato Lab boards from here. For Verilog, module declarations with complex or split ports are not supported. With a design open in. First, create a project Tcl in the vendor gui. You can follow this for the Xilinx-provided ug947-vivado-partial-reconfiguration-tutorial. xml of IP Catalog export of VIVADO HLS it automatically populates the field with file name same as top module. The control to run synthesis on the module is controlled by the synth attribute, and assigned to one of the flow control variables at the top of design. The Arty board is the next generation of the very useful LX9 MicroBoard however, it takes account of advances in devices and interfacing. xpr) by default. Truth table of simple combinational circuit (A, b, and c are inputs. Implementation Note: ISE/Vivado projects are automatically recognized by the DVT build auto-configuration engine. So the reported behavior is related to the non-module files. Declare a type for creating access objects, pointers. TIP: In the directory, multiple log files have been created:. If using Vivado, make sure to select "write all project properties" when generating the Tcl. I believe the project was originally created in ISE as there is no Tcl file to run and regenerate the original block design from. The hierarchical sources view (HSV) feature in Vivado IDE and PlanAhead(version 13. Creating a Module Using Vivado Text Editor; Creating Test Bench; Simulating with Vivado Simulator; COUNTER. I wonder how such code is generated in vivado - i mean, is there any ready-to-use graphical library that generates such code? Many projects contains only vhdl files (without any blocks design). The last thing make does in this above example is building the project. 4) Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. se March 21, 2017 This tutorial shows you how to create and run a simple MicroBlaze-based system on a Digilent Nexys-4 prototyping board. Vivado Project files will be generated with these scripts. Open the file and make the following change to line 204: E. `readmemb'. tcl (for easier access). -project [Optional] try to open the file from the specified project If the file does not exist in the given project, it is opened from any other project in the workspace. The Basys 3 is an entry-level FPGA development board designed exclusively for Vivado Design Suite, featuring Xilinx Artix-7 FPGA architecture. You first turn it into a component and test it. The HDL is released as git branches bi-annually. Which file to choose for Main Simulation Entity? When I import using xml file from configuration. I have installed Vivado 2018. I am currently working on a project in Vivado 2017 using the external mux. I am using Google Chrome, I would. FPGA Vivado. I have also disabled the constraints file in case if it is conflicting with the procedure. Then re-add the file to the project using the "Add sources" command. If you change the module and over write the generated TCL description. tcl > > with a foo. I was exploring the add_vivado_ip as part of an effort I am working on to generate compile order on a project using vunit. The hardware will be using. As demonstrated by this example the memory array can have more entries than the data file. Review the available reports, analyze the design with the Schematic and Hierarchy viewers, and run a design rule check (DRC). File operation using readmemh for reading hexadecimal values from test files. In this tutorial we will create a simple VHDL project using the text editor of Xilinx Vivado 2016. 1) Note: you will need the Xilinx Vivado Webpack version installed on your computer (or you can use the department systems). If using Vivado, make sure to select "write all project properties" when generating the Tcl. The Vivado Design Suite provides an environment to configure, implement, verify, and integrate IP as a standalone module or within the context of the system-level design. My task was to write the top module to display 3 bit output of the counter on the 7 segment display. To boot from QSPI Flash we need. in lower modules. It will take a lot of time, around 1 or 2 hours. During the simulation, the test bench should be a “top module” (top-level module) with no I/O ports. Learn how to use the Module Referencing technology to instantiate RTL directly into an IP Integrator block design. In capture 1 the verilog files appear under non-module files. Design Suite release 2014. xpr) Xilinx Vivado uses project files (. I use Vivado to compile the simulation files for the encrypted IPs. This Naming Convention will be used for the most Vivado 2016. You'll have to paste the above code over the top module source code (axis_fifo_v1_0. In this module. 1) Note: you will need the Xilinx Vivado Webpack version installed on your computer (or you can use the department systems). All other options are described on: Vivado Projects. Click Create File …, type the file name dummy and click OK. Just press Ctrl+I. In order to create the needed data, Vivado launches an executable named srcscanner. The next few lines specifies the i/o type (input, output or inout, see Sect. The hardware we are using is ZYNQ XC72Z020 CLG400ABX1601 D5170858A. Please help me choosing the file backed by proper reason. TE Board Part Files. If the file does not exist in any project, it is opened out of any context (limited DVT capabilities). Click Yes, the text fixture file is added to the simulation sources: Open up the nearly created comb. The Vivado® Design Suite allows you to create projects based on specific boards. For more information on design flows, see the Vivado Design Suite User Guide: Design Flows Overview (UG892). 4 as well as newer versions. You'll have to paste the above code over the top module source code (axis_fifo_v1_0. The log file, in this example, is called 'daq2_zc706_vivado. Setting Up the Design. The easy way to get memory files working with Vivado is to give them the. This course provides professors with an understanding of high-level synthesis design methodologies necessary to develop digital systems using Vivado HLS. In the top left of the Vivado window select "Add Sources" under "Project Manager". We will first create a 1-bit Logical AND. IPI: Batch file and Vivado TCL scripts to create new Vivado project and create MicroBlaze system block design. After all five passes through Vivado Synthesis have completed, the Vivado Tcl shell is left open. J and k are outputs) a b c j k 0 0 0 0 1. Declare an integer to set a pointer to read values from test file. You can find log and report files for each module, alongside the final checkpoints, under each named folder in the Synth subdirectory. c C test bench for the FIR design. The Arty board is the next generation of the very useful LX9 MicroBoard however, it takes account of advances in devices and interfacing. The design was targeted to an Artix 7 FPGA (on a. Someone else who has the same FPGA and a slightly newer version of Vivado did exactly what I did and he successfully analyzed the project at his workbench. IP can include logic, embedded processors, digital signal processing (DSP) modules, or C-based DSP algorithm designs. xpr opened by vivado, I did not see any other ip in the project?. It is exactly the same 'rule' as the library component. In order to do so, you need to create a 4-bit wide output port in module myled_v1_0_S_AXI called led, as shown below. Advantage of coding a task in a separate file, is that it can be used in multiple modules. Re: How to reintegrate "Non-Module Files" in Vivado? Jump to solution It is here I guess(it will mostly go unnoticed as Xilinx will consider this as a bug) or better to a FAE in your area. Vivado Non-Project Mode (Part II) - building off a solid foundation January 29, 2017 September 1, 2019 ~ Amol In my last post we talked about Vivado's Non-Project mode to build FPGA designs. com 49 Creating the AXI MPMC Design from a New Vivado Tools Project Module Instantiation and System Connection After the necessary system modules are added to the project, they must be instantiated and connected. e 100Mhz to the clk of my top module in the wrapper file. Synthesis will be re-run and then the implementation will start. - Vivado HLS determines in which cycle operations should occur (scheduling) - Determines which hardware units to use for each operation (binding) - It performs HLS by : • Obeying built-in defaults • Obeying user directives & constraints to override defaults • Calculating delays and area using the specified technology/device. The source files created can be found in the Sources menu at the top left, double click on any file to open it for editing. This hierarchical design methodology will help manage design complexity, promote design reuse, and allow parallel development. 'make -C projects/adrv9371x/' should be all that is necessary to build the project. The release branches are created first and then tested before being made official. Design Suite release 2014. Microblaze MCS Tutorial Jim Duckworth, WPI 1 Microblaze MCS Tutorial for Xilinx Vivado 2015. The IP cache generated by Vivado is supplemented by RapidWright by providing placed and routed DCPs and module files in each hash-named directory for each non-trivial IP. You can follow this for the Xilinx-provided ug947-vivado-partial-reconfiguration-tutorial. If the file does not exist in any project, it is opened out of any context (limited DVT capabilities). 2 Linux Worker required for some non Virtex-II FPGAs. In some cases, however, project files are not used – especially when the target FPGA design is not synthesized with Vivado, but with a third-party EDA sythesis tool (such as Synplify). The I/O and other forms of constraints are configured in a constraints file, which has the extension XDC in Vivado. After all five passes through Vivado Synthesis have completed, the Vivado Tcl shell is left open. Add the SystemVerilog file you created in exercise 1 to your project by following the adding a design file section of the Adding a SystemVerilog Module tutorial. The HDL is released as git branches bi-annually. xpr This file is the Vivado IDE project file that describes all of the attributes of the Vivado IDE design. Project Mode The Vivado Design Suite lets you create a project file (. I am currently using xc7z020clg400-1 part. top_gen_mon_i) are instances of the entities (eg. View an introduction to the Vivado Integrated Design Environment (IDE) and an overview of design flows from synthesis and simulation through implementation. I use Vivado to compile the simulation files for the encrypted IPs. xml file in their IP cores. 'make -C projects/adrv9371x/' should be all that is necessary to build the project. Then, the netlist obtained from the out-of-context implementation will replace the HDL version of the OOC block when implementing the top-level module. I use Vivado to compile the simulation files for the encrypted IPs. From here you navigate to the directory that contains the source files you want to import. 1 Verilog for Testbenches Verilog for Testbenches Big picture: Two main Hardware Description Languages (HDL) out there VHDL Designed by committee on request of the DoD. e 100Mhz to the clk of my top module in the wrapper file. inc can't all kinds of node stuff like have dependencies and implement hooks and so on. This hierarchical design methodology will help manage design complexity, promote design reuse, and allow parallel development. Vivado Tutorial Introduction This tutorial guides you through the design flow using Xilinx Vivado software to create a simple digital circuit using Verilog HDL. Hi, Quite often I see such piece of code on the github repositories. I'm using Vivado 2017. Depending on the Schema Version of the XML-Files and Xilinx IP definitions,. The same goes for 'Test Bench' in the same Explorer menu. Show/Hide Code. Constraint Files. Use the Verilog Instatiation Template and update Top Module* 4. WPI: ECE3829/574 Jim Duckworth. In Vivado 2017. The LabVIEW FPGA Module provides an option to export an FPGA VI as a Vivado Design Suite project. View an introduction to the Vivado Integrated Design Environment (IDE) and an overview of design flows from synthesis and simulation through implementation. Disable I/O insertion to create Reconfigurable Module netlists. v then click "Finish". they can be implemented in their own files if desired. I use Vivado to compile the simulation files for the encrypted IPs. Create a new VHDL file called logic_function. I was exploring the add_vivado_ip as part of an effort I am working on to generate compile order on a project using vunit. Creating a Module Using Vivado Text Editor; Creating Test Bench; Simulating with Vivado Simulator; COUNTER. Save the image file (image. After sending he sent the modified test project back to me, I was able to create the debug core and it functioned as intended. Opening the source file. 'make -C projects/adrv9371x/' should be all that is necessary to build the project. Finally, assign some of the I/O pins using the IO Planner. top_gen_mon_i) are instances of the entities (eg. Install Board Part files from the reference project, as described in option 2 or option 3 from Vivado Board Part Flow Installation Create new empty Vivado Project (without import any files, select only the correct board part) (Vivado Version must be the same as the project zip files version). Vivado 2017. The most error-proof method I have personally found to go about this is that I select the option to allow for Vivado to manage the HDL wrapper, then create my own module in Project Manager by selecting 'Add Sources' → 'Add or Create Design Source' and I simply copy+paste the instantiation from the auto-generated wrapper file into my own. If you re-download the Vivado-libraries both the PmodWIFI and the PmodSD IP's will be available to use in Vivado 2015. I wonder how such code is generated in vivado - i mean, is there any ready-to-use graphical library that generates such code? Many projects contains only vhdl files (without any blocks design). xpr opened by vivado, I did not see any other ip in the project?. v > run -all > > The second form allows you to restart a simulation after you edit the files. md file on how to install Vivado Board Support Package files for. I ordered mine just before I recently flew to Japan, and it was waiting for me when I returned. 3, Vivado SDK has been installed successfully, but in x64 ubuntu, we still cannot find vivado in Dash, so we have to add it by ourselves: Complimentary Video to https://github. In addition, I used Vivado Webpack instead of ISE. A test bench is nothing but another Verilog module that generates some signals and feeds it to the module under test. Table 1-1: Lab 1 File Summary Filename Description fir. Then open Vivado: Create a new project with the assistent. Add your Digilent FPGA board definitions and presets to Vivado. Xilinx Hello World appears only one time on startup, so use HW-Reset Button on Module or Vivado Hardware Manager "Boot from Configuration Memory Device" Command to reboot PS. The I/O and other forms of constraints are configured in a constraints file, which has the extension XDC in Vivado. If you change the module and over write the generated TCL description. I also tried removing and re-adding the file, and also regenerating it (using generate HDL wrapper on the block design). txt) as sobel. The scripts sets up PS7 peripherals, DDR3L trace delays, clock/PLL settings, etc. In general, you run Non-Project Mode using Tcl commands or scripts. If the source scanner is unable to parse the file for any reason, the file will be listed under the Non-module folder. Then reference this in the files_l list. foo is present in the project location, but I can't see it in the Navigator View How to copy the full path to the file in the current editor? How to adjust the console logs filters matching parameters?. View an introduction to the Vivado Integrated Design Environment (IDE) and an overview of design flows from synthesis and simulation through implementation. Referencing RTL Modules for use in Vivado IP Integrator Vivado 2015. c to run print "Hello World" in endless loop. 7a This must be the entity name of the design you are trying to test. My task was to write the top module to display 3 bit output of the counter on the 7 segment display. md file on how to install Vivado Board Support Package files for Numato Lab boards. > or you can use > vivado -mode tcl -source foo. You first turn it into a component and test it. 1 installer is the first installer to NOT install Engineering Sample device files by default. You're using an out-of-date version of Internet Explorer. What is a Constraints file When programming an FPGA through software such as Xilinx's Vivado, you need to inform the software what physical pins on the FPGA that you plan on using or connecting to in relation to the HDL code that you wrote to describe the behavior of the FPGA. IPI: Batch file and Vivado TCL scripts to create new Vivado project and create MicroBlaze system block design. Bitstream generation. Trenz Electronic provides Vivado Board Part files in the download area. for the SOM only (no carrier peripherals). To boot from QSPI Flash we need. This will not only launch SDK but will create the entire hardware platform specification file stuff. Make sure File type is set to "Verilog" and name the file top. com website. However for loops perform differently in a software language like C than they do in VHDL. I also used Xilinx ISE Webpack. IPI_repo: Repository of files and IP needed to create the MicroBlaze hardware platform. The content of this course module is included within the Vivado Adopter Class course (shown below) and Vivado Adopter Class for New Users. In general, you run Non-Project Mode using Tcl commands or scripts. You do this as you would for a design or simulation source using "Add Sources" then selecting "Files of type: Memory. For the changes to take effect in your project you must reload it in to Vivado and then re instantiate it. We have introduced on this lecture about how to write a testbench on VHDL and how to run that testbench file on VIVADO Simulator for generating simulation Waveform. 0 FPGA Module Xilinx Compilation Tool for Vivado 2017. The most error-proof method I have personally found to go about this is that I select the option to allow for Vivado to manage the HDL wrapper, then create my own module in Project Manager by selecting 'Add Sources' → 'Add or Create Design Source' and I simply copy+paste the instantiation from the auto-generated wrapper file into my own. As an example, the following module declaration contains both complex and split port. Open Vivado 2017. In order to do so, you need to create a 4-bit wide output port in module myled_v1_0_S_AXI called led, as shown below. 4) start up command files are available to generate the project: Project Delivery QuickStart. Then open Vivado: Create a new project with the assistent. Just press Ctrl+I. 2, but if you extract the files as instructed to your 2019. Display the values from the text file on the compiler screen. – Vivado HLS has a lot of freedom with this operation • It waits until the read is required, saving a register • There are no advantages to reading any earlier (unless you want it registered) • Input reads can be optionally registered – The final multiplication is very constrained… Data Dependencies: Good void fir (… acc=0;. In the top left of the Vivado window select "Add Sources" under "Project Manager". Disable I/O insertion to create Reconfigurable Module netlists. module clock_divider#(parameter HALF_CYCLE_COUNT = 128, Stack Exchange Network Stack Exchange network consists of 175 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. IPI: Batch file and Vivado TCL scripts to create new Vivado project and create MicroBlaze system block design. Vivado will ask to save the pin constraints. xpr opened by vivado, I did not see any other ip in the project?. Even then, the new file appears under "non-module files". add the code to our Verilog module that tells Vivado what the module is supposed to do, change the XDC file to inform Vivado what physical pins you intend to use with your module, add IP if you choose to do so, and more. Open the file and make the following change to line 204: E. Then, the netlist obtained from the out-of-context implementation will replace the HDL version of the OOC block when implementing the top-level module. During the simulation, the test bench should be a “top module” (top-level module) with no I/O ports. Update 2017-11-01: Here's a newer tutorial on creating a custom IP with AXI-Streaming interfaces Tutorial Overview. Repeat the steps in the previous section to generate the netlist for this alternative version of the user module. For more information about the Vivado IDE and the Vivado Design Suite flow, see: • Vivado Design Suite User Guide: Using the Vivado IDE (UG893) [Ref3] • Vivado Design Suite User Guide: Design Flows Overview (UG892) [Ref11] Simulation Flow Simulation can be applied at several points in the design flow. Is it possible to get an example-project (project file) to gain insight how and where to implement own IP-cores. Synthesis will be re-run and then the implementation will start. For now, select the Verilog file you created. In the top left of the Vivado window select "Add Sources" under "Project Manager". Digilent’s Basys 3 is a trainer board for introductory FPGA users, and is built around one of Xilinx’s Artix-7 devices. Review the available reports, analyze the design with the Schematic and Hierarchy viewers, and run a design rule check (DRC). In some cases, however, project files are not used - especially when the target FPGA design is not synthesized with Vivado, but with a third-party EDA sythesis tool (such as Synplify). Just to add, I am using Xilinx Vivado for code compilation. Click Finish. Essential Tcl for Vivado is a 2-day course teaching the essentials of the Tcl language with particular focus on its application within the Xilinx Vivado Design Suite. Step 1: Download and install Vivado Board Support Package files for Mimas A7 from here. Add your Digilent FPGA board definitions and presets to Vivado. Xilinx - Vivado FPGA Essentials ONLINE (Also known as Essentials of FPGA Design by Xilinx) view dates and locations PLEASE NOTE: This is a LIVE INSTRUCTOR-LED training event delivered ONLINE. they can be implemented in their own files if desired. 1 the engine that generates the hierarchy data displayed on HSV tab was updated. • For sample syntax and a list of VHDL statements supported by the VHDL Synthesizer, see Appendix A, "Quick Reference. txt and gaussian. md file on how to install Vivado Board Support Package files for Numato Lab boards. I clicked on "Add Sources" then "Add Constraints File" and pointed to the. mcs file so, select output format as MCS if not already selected. The log file, in this example, is called 'daq2_zc706_vivado. I think the easiest way to get this name is by searching for one of the files in the Vivado project that uses the top level module name. Another Verilog file will be used to wrap up the mux and de-mux to form a communication system. Generate DCP’s for static design and RM modules i. The easy way to get memory files working with Vivado is to give them the. Just for completeness, here is one way to call the script from Vivado:. Create the module. It is one of the first steps. During the simulation, the test bench should be a “top module” (top-level module) with no I/O ports. md file on how to install Vivado Board Support Package files for. The I/O constraints are, in essence, the assignment of the Zynq EPP's pins with the top module's ports and the configuration of the port's I/O standards. The release branches are created first and then tested before being made official. v > run -all > > The second form allows you to restart a simulation after you edit the files. We do not currently have Vivado Board Definition Files for PicoZed SDR. Project Mode The Vivado Design Suite lets you create a project file (. 'make -C projects/adrv9371x/' should be all that is necessary to build the project. Open Vivado 2017. For loops can be used in both synthesizable and non-synthesizable code. for example, system_cron() is implemented on behalf of file. The content of this course module is included within the Vivado Adopter Class course (shown below) and Vivado Adopter Class for New Users. Next step is to click on the design sources and export the top-level wrapper file. Vivado Non-Project Mode (Part II) - building off a solid foundation January 29, 2017 September 1, 2019 ~ Amol In my last post we talked about Vivado's Non-Project mode to build FPGA designs. See: Design Examples. I have also disabled the constraints file in case if it is conflicting with the procedure. IPI: Batch file and Vivado TCL scripts to create new Vivado project and create MicroBlaze system block design. The lower part of the tree shows the Simulation Sources which show the Simulation hierarchy of the design. IPI_repo: Repository of files and IP needed to create the MicroBlaze hardware platform. If a testbench is requested, then, in addition to the above, System Generator produces files that allow simulation results to be compared. xpr) and directory structure that allows you to: • Manage the design source files. If everything went well, Styx should boot up from SD card and print "Hello World" repeatedly over USB-UART on the serial terminal application. The Quick Compile Order View will pop-up and you can enter any regular expression to locate a file. You can view and modify the source code by opening the file from the Source directory. • Bottom-up synthesis (to create multiple netlist files) and management of Reconfigurable Module netlist files is the responsibility of the user. You can then run the bitfile on an FPGA target, such as a Kintex-7 FlexRIO target or a High-Speed Serial Instrument, in the FPGA Module. You can use packaged IP within a Project or Non-Project-based design. Such a system requires both specifying the hardware architecture and the software running on it. If you need a switch/led etc. This file contains the entity of module definitions of sysgen blocks in the design. All the input outpu ports should be present in the constraint file and only variables from the top module should be written in the constraint file.